Trin & Stor - NTI Boilers

Trin & Stor Model Numbers: S, S-SR Series

Version Date: 2016-04-15

30 Stonegate Dr.

Saint John, NB E2H 0A4 Canada

INDIRECT WATER HEATERS

INSTALLATION AND OPERATION INSTRUCTIONS

To be installed in conjunction with an NTI Boiler

TABLE OF CONTENTS

1.0 INTRODUCTION ................................................................................................................ 2

Trin & Stor Specifications .................................................................................................... 2 Solar Certifications and Approvals ....................................................................................... 2 I.O.M. Checklists .................................................................................................................. 3

2.0 WATER HEATER PIPING ................................................................................................. 7

Domestic Side Piping ........................................................................................................... 7 Boiler System Piping ............................................................................................................ 9 Solar System Piping .............................................................................................................. 9

3.0 TANK SENSOR ................................................................................................................. 14

4.0 START UP AND CHECK OUT ........................................................................................ 18

5.0 ANNUAL MAINTENANCE AND INSPECTION ........................................................... 18

6.0 PARTS LIST ...................................................................................................................... 19

HAZARD SYMBOLS AND DEFINITIONS

Danger Sign: Indicates a hazardous situation which, if not avoided, will

result in serious injury or death.

Warning Sign: Indicates a hazardous situation which, if not avoided,

could result in serious injury or death.

Caution Sign plus Safety Alert Symbol: Indicates a hazardous situation

which, if not avoided, could result in minor or moderate injury.

Caution Sign without Safety Alert Symbol: Indicates a hazardous

situation which, if not avoided, could result in property damage.

Notice Sign: Indicates a hazardous situation which, if not avoided,

could result in property damage.

This Indirect Water Heater must be installed by a licensed and trained

Heating Technician or the Warranty is Void. Failure to properly

install this unit may result in property damage, serious injury to occupants, or possibly death.

NTI 84230

S-SR Series

S Series

Trin & Stor │ Installation and Operation Instructions Indirect Water Heaters

2

1.0 INTRODUCTION

Trin & Stor Specifications

NTI offers two (2) series of Indirect Water Heaters: "S" Series consists of a high performance stainless steel tank and heat exchanger coil and "S-SR" Series consists of a stainless steel tank with dual heat exchanger coils. The S-SR is a multipurpose tank for use in many applications. For example, S-SR is equipped with a Solar Domestic Hot Water backup via a second heat exchanger coil for boiler supply connections ("S-SR" models). It can also be used as: a single boiler as a normal indirect, or with a second boiler for increased recovery rate.

Solar Certifications and Approvals

S80SR and S120SR, when properly installed and maintained as per this manual and the Sol-R-Therm System

manual, meet the minimum standards established by US Standard SRCC OG-300 and Canadian Standard

CAN/CSA F-379.1-09 for packaged solar domestic hot water systems. See NTI Sol-R-Therm System, Packages

SRT-Pk1 and SRT-Pk2.

Table 1-1 Indirect Water Heater Specifications

Model

Storage

Capacity

USG (L)

Type Weight (lbs)

Hour 1 Recovery 3

(Gal @ Outlet Temp) Boiler

Output

(MBH)

Coil Flow

Rate

(GPM)

Coil

Drop

(Feet)

Continuous Rate (GPH @ Outlet Temp)

Empty Filled 1 140 F 115 F 140 F 115 F

S40 40 (150)

Stainless Steel

Indirect

71 485 213 319 155 10 1.3 181 287

S50 53 (200) 90 655 251 372 180 10 1.6 211 332

S65 66 (250) 104 672 327 484 234 15 3.5 275 432

S80 79 (300) 115 995 378 559 268 15 4.7 314 495

S120 119 (450) 157 1275 485 711 333 20 9.4 389 615

S80SR 79 (300) Stainless Steel Solar

Indirect

118 840 157 Upper 214 Upper

220 10.4 4.6 182 Upper 291 Upper

166 Lower 274 Lower 4.8 193 Lower 307 Lower

S120SR 119 (450) 177 1190 167 Upper 239 Upper

290 13.6 7.6 194 Upper 310 Upper

177 Lower 274 Lower 8.0 205 Lower 328 Lower

Notes: 1 Ensure the location chosen for the tank is capable of supporting the tank when filled with water.

2 Refer to Table 1-3 for a list of considerations when selecting a location for the tank.

3 Hour 1 Recovery based on 50

oF inlet water temperature and 200

oF boiler water outlet temperature.

Table 1-2 Indirect Water Heater Characteristics

Attribute S Series S-SR Series

Tank 1 stainless steel stainless steel

Coil stainless steel stainless steel

Insulation EPS foam EPS foam

Jacket grey plastic grey plastic

Recommended Service Clearances

top 12" top 12"

connection side 12" connection side 12"

boiler connections as required boiler connections as required

MAWP 150 psi MAWP 150 psi

Restrictions Max tank temp 190oF Max tank temp 190

oF

Max boiler temp 210oF Max boiler temp 210

oF

Notes: 1 Water used in the tank must meet the water chemistry limits specified in Table 2-1. Levels outside the limits may

corrode the tank and shorten its life resulting in damage to tanks and voiding the warranty.

Indirect Water Heaters Installation and Operation Instructions │Trin & Stor

3

Table 1-3 Trin & Stor System Contents

Part No. Description S Series S-SR Series

S40

Indirect Water Heater, Stainless Steel 1 - S50

S80

S120

S80SR Indirect Water Heater, Stainless Steel - Solar - 1

S120SR

84156 Temperature and Pressure Relief Valve, 150psi 1 1

84632 Tank Sensor 1 See Note 1

Notes: 1 All NTI Indirect Water Heaters come standard with a Tank Sensor (not applicable for solar applications).

Parts and Service - See Table 1-3 for a list of components included with each tank and Table 6-1 for replacement

parts. For inside sales or technical support, contact NTI by email at [email protected] or call toll free 1-800-

688-2575.

Warranty Registration - Trin & Stor tanks have a Limited Lifetime Warranty. A separate Warranty Card is

shipped with the tank and packaged with the manual kit. The warranty card explains the coverage options, terms

and conditions, actions required to register the warranty, and what to do in the case of a warranty service problem.

I.O.M. Checklists

The various Installation, Operation and Maintenance (IOM) Checklists contained in this manual are meant to be

read in conjunction with the details, drawings and safety information to ensure a complete and proper installation.

Pre-Installation Checklist

Inspection and Preparation

1. Remove packaging. Inspect for damage during shipping.

2. Verify package contents as per Table 1-3.

3. Review system specifications and characteristics.

4. Read the Water Chemistry and Warranty requirements.

Locating the Tank

1. Solid foundation, dry location, near boiler.

2. Leave room to service water heater and controls.

3. Sufficient room for boiler piping and servicing boiler.

4. Area free of flammable liquids or combustible vapors.

5. Install where leaks will not damage property.

6. Locate in room where temperature never drops below 50oF (10

oC).

Building Interface Requirements

Penetrations through which piping or wiring is passed shall not:

1. Reduce or impair the function or structural integrity of the enclosure.

2. Work shall be performed in accordance with applicable standards, ordinances, and local codes.

Water Damage Protection

1. If the area around the tank location is susceptible to water damage, install a catch pan c/w drain under the tank.

2. Make provisions to protect the surrounding area from water damage should a leak occur from the tank, fitting

connections, or relief valve.


4

General Installation Requirements

Generalized instruction and procedures cannot anticipate all situations. For this reason, only a qualified installer

should perform the installation.

Users Responsibility – This manufacturer anticipates the proper installation and care in use of the product. As

with any hot water system, there is a risk of property damage and personal injury inherent in the use. NTI

cannot supervise the installation and therefore makes it a specific condition for the warranty that the customer

will supervise the installation and use of the product to be sure they are performed in accordance with the

instructions and I.O.M. Checklists in this manual. It is the User’s responsibility to maintain the appliance by

having it inspected on an annual basis, serviced as required, and to use the product for the purpose it was

intended.

Installers Responsibility – A qualified installer is a licensed person who has appropriate training and a working

knowledge of the applicable codes, regulations, tools, equipment and methods necessary to install an indirect

water heater. The Installer assumes all responsibility for a safe installation and that it meets the requirements

of this document, as well as National and local codes.

Consider the following when selecting a location for the Indirect Water Heater: All tanks will eventually leak at

some unpredictable time, so take precautions and use a catch pan with a drain beneath the water heater to contain

potential leaks or install the tank in a location not susceptible to water damage. Do not install near a wood stove

where excessive heat could melt the water heater’s plastic jacket. Boiler supply piping, floor drain locations,

relief valve discharge will also need to be considered before selecting a location.

Scope of Instruction - This document pertains to the correct installation and operation

of the NTI Trin & Stor Indirect Water Heater line. This manual DOES NOT provide

installation instructions for heating system boilers; therefore, installers must refer to the

boiler manufacturers instructions for boiler installation procedures.

Emergency Situation - Should the water heater be subject to flood, fire or other

damaging conditions turn the power and water to the heater off. DO NOT place water

heater in operation again until it has been thoroughly checked by qualified service

personnel.

Raised Tank - Support the entire tank bottom with ¾" plywood (min) if elevating off the floor with blocks.

Code Requirements - The installation of your NTI Trin & Stor Indirect Water Heater

must conform to the requirements in this manual, as well as National and local codes.

Safe Location - DO NOT install indirect water heater close to any high temperature

appliances or wood stoves as the water heater jacket is combustible. Do not install where

there is a risk of property damage in the event of an eventual leak at some unpredictable

time.

Annual Service - Failure to have the Indirect Water Heater properly serviced and

inspected on a regular basis by a qualified service technician may result in property

damage, serious injury or death.

Flammable Vapors - DO NOT install this appliance in any location where gasoline,

flammable vapors or air-born contaminants are likely to be present.

Warranty Requirements - Improper installation, use, neglect or abuse of this product

may not only jeopardize the safe operation of this appliance but also void the warranty.

Read and understand this manual prior to proceeding with the installation of the Trin &

Stor Indirect Water Heater and the potential hazards associated with DHW. Failure to

follow the instructions outlined in this document will result in property damage, serious

injury or death.


5

Safe Temperatures for Potable Water

Two factors used to determine safe hot water temperatures are Legionella and scalding. Potable water needs to be stored at temperatures hot enough to limit the growth of Legionella, yet be cool enough to prevent scalding. Since both hazards present a potential risk to the user, they must be monitored and controlled. Table 1-4 indicates how water temperature affects Legionella bacteria and contributes to scald injury. Use of a thermostatic mixing valve in the indirect water heater plumbing system can help protect against both of these hazards. By storing potable water at higher temperatures, bacteria growth is controlled, while still providing high temperature water for dishwasher applications and low temperature water for bathing. Before proceeding, read the following carefully and take all necessary precautions to avoid potential illness and/or injury that can result from Legionella or scalding hazards.

Legionella Hazard - This bacteria is naturally occurring in surface water and ponds. It

can also be found in man-made water systems around the world such as water storage

tanks, water distribution systems, fountains, hot tubs, humidification systems, refrigeration systems and grocery

produce misters. Health authorities agree that Legionella bacteria most often enter the lungs due to aspiration

when contaminated water spray is breathed in as opposed to ingesting drinking water contaminated with the

bacteria. Typical illnesses attributed to Legionella include flue like symptoms (Pontiac Fever) and a potentially

fatal type of pneumonia (Legionnaires’ disease). Failure to follow instructions may result in illness or death.

Contributing Factors to Legionella - Experts acknowledge that Legionella is an identified risk in most water

systems. Although eradicating Legionella is improbable, precautions can be taken to control and monitor

conditions that promote bacteria growth. According to the World Health Organization (WHO); American

Society of Heating, Refrigeration, and Air-conditioning Engineers (ASHRAE); Canada Safety Council (CSC);

and Centers for Disease Control (CDC), contributing factors to the growth of Legionella in potable water

systems include:

Minerals and nutrients present in the source water and systems materials

Stagnation or low flow characteristic of dead ends in distribution piping systems and storage tanks

Scale, corrosion, and bio film

Tepid water in cold water lines

Water storage temperatures optimal for bacteria growth

Chlorine concentration

Scald Hazard - Hotter water increases the risk of scald injury. There is a hot water scald potential if the storage tank thermostat is set too high. Before changing the temperature

setting on the tank thermostat, refer to the thermostat manufacturers recommended settings. Failure to follow these instructions may result in serious injury or death.

A scald injury can occur when hot steam or liquid makes contact with one or more layers of skin. Scald severity (degree of burn) is directly impacted by exposure time and temperature. Refer to Table 1-4. The following basic precautions are common sense:

Young children and elderly adults burn more quickly and should use cooler water.

Never leave a child alone while drawing water in a bathtub.

Test the water temperature before bathing or showering.

Turn cold water on first, then add hot water until the temperature is comfortable. Thermostatic Mixing Valve - When the system requires water at temperatures higher than required for other uses, such as high temperature applications typically greater than

46oC (115

oF), a means such as a thermostatic mixing valve shall be installed to temper the water for those uses

in order to reduce scald hazard potential. Anit-scald devices such as a thermostatic mixing valve allows potable water to be stored at a higher temperature to limit bacteria growth, and allows water at the tap to be delivered at a lower temperature to prevent scalds. Failure to follow these instructions may result in serious injury or death.


6

Legislation and Guidelines - At the time this document was written, standards and

guidelines regulating the prevention of Legionella in the United States and Canada were

mostly voluntary. The American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.

(ASHRAE) is currently in the process of converting its guideline entitled "Minimizing the Risk of Legionellosis

Associated with Building Water Systems" (ASHRAE Guideline 12-2000) into an official standard. Consult with

your local authorities as to recommended guidelines for controlling Legionella in potable water systems.

Storing water at temperatures >140°F may not be permitted in some States, so check

with the authorities having jurisdictions. In Canada, recent changes to the National

Plumbing Code requires that domestic hot water be stored at or above 61oC (140

oF) and

then mixed down to safe temperatures at the tank outlet.

General Guidelines - In the absence of a National standard or local codes, the following are general guidelines

for “good practice” on maintaining, monitoring and operating your potable water system:

Store domestic hot water at temperatures > 61oC (140

oF).

Store and distribute cold water at temperatures below 20oC (68

oF).

System supply for uses other than high temperature applications typically greater than 46oC (115

oF) shall be

equipped with a thermostatic mixing valve on the hot water outlet to reduce potential scald hazards.

Clean aerators and nozzles on water fixtures on a regular basis to reduce scale build-up.

Clean storage tanks and remove sediment. Flush storage tanks and piping systems regularly for 10-30

minutes at high water temperatures (depending on guidelines used) to rid the system of sediment and scale

that develops, typically in the bottom of storage tanks where water temperature is coolest; and piping runs

where water can stagnate.

Abandoned water lines should be capped off at the distribution main, not at the most convenient place.

Avoid dead-ends in piping system. If unavoidable, provide a drainage port in these areas at the lowest point

to flush out stagnant water regularly.

Insulate Domestic Hot Water piping and recirculation lines to R-2.6.

Insulate the last 5 feet of the cold water line entering the tank to R-2.6.

Keep pipe runs as short as possible to avoid unnecessary heat loss.

Recommend annual water testing of water in your tank and piping system(s) to monitor water conditions.

Keep a maintenance record of when your indirect water heater and storage tank were cleaned, piping

systems flushed and who did the service work.

Table 1-4 How Water Temperature relates to Legionella and Scald Hazard

Water Temperature 1 Legionella Bacteria

1 Water Temperature

2,5 Exposure Time vs Burn

5

158-176oF 70-80

oC Disinfection range 158

oF 70

oC 1 second - 2

nd or 3

rd degree burn

140-149oF 60-65

oC Bacteria die within minutes 140

oF 60

oC 5 seconds - 2

nd or 3

rd degree burn

122-131oF 50-55

oC Bacteria die within hours 131

oF 55

oC 5 seconds - 1

st degree burn

68-113oF 20-45

oC Bacteria thrive and multiply 122

oF 50

oC 1 minute - 1

st degree burn

below 68oF below 20

oC Bacteria is dormant 111

oF 44

oC 5 hours - 1

st degree burn

3,4

Notes: 1

Published by Chartered Institute of Plumbing and Heating Engineering, Databyte series, "Safe Hot Water Temperatures". 2 The elderly and small children are susceptible to bad burns at shorter exposure times than listed in this table.

3 A thermostatic mixing valve should be installed on DHW storage tanks when outlet temperatures exceed 115

oF [46

oC].

4 Typical water temperature for bathing or showering range between 98-113

oF [37-45

oC].

5 Temperature-Time-Burn Chart published by John Hopkins University, excluding notes.


7

2.0 WATER HEATER PIPING

Failure to follow the instructions provided in this section will void your NTI warranty

and may result in property damage, fire, serious injury or death.

Domestic Side Piping

The various series of NTI Trin & Stor indirect water heaters are dimensioned and connection ports marked in

Figures 2-1 and 2-2. Dimensioned drawings are to be read in conjunction with Table 2-3 and 2-4 which identify

the connection type and port size and illustrates typical domestic water piping for a single indirect water heater.

Basic system components are identified in Table 2-2 and their function described in detail below. For multiple

Indirects, pipe the tanks in parallel using equal pipe lengths between each tank and a common tee to ensure

equalized draw.

Energy Efficiency - Although the NTI Trin & Store Indirect Water Heater is an energy-efficient appliance,

insulating long pipe runs can improve the system efficiency by conserving energy and reducing standby losses.

System Preparation - Prior to connecting plumbing to the indirect water heater, flush the entire system to ensure it is free of impurities that may be harmful to the system or indirect water heater. Check the water composition of the domestic water supply prior to filling the tank to ensure the water characteristics are within the range specified in Table 2-1. Water used in the tank must meet the water chemistry limits specified in Table 2-1. Levels outside the limits may corrode the tank and shorten its life resulting in damage to the tank and voiding the warranty. If levels are outside the acceptable limits, consult a qualified water treatment expert about treatment options for domestic water.

Damage to tanks resulting from water chemistry levels outside the ranges specified in

Table 2-1 can cause corrosion, shorten the life of the tank, and will void the warranty.

Table 2-1 Water Chemistry Requirements

Characteristic "S" series "S-SR" series

Many solder fluxes can severely

corrode stainless steel. Once piping

connections are completed, flush the

water heater by drawing at least three

(3) times the tank’s volume through

the water heater prior to heating water

in the tank. Failure to flush the tank

will void the warranty.

PH Min 6.0 Min 6.0

Max 8.0 Max 8.0

Chloride (ppm) Min 0.0 Min 0.0

Max 80.0 Max 80.0

Notes: 1 Residual solder flux can corrode stainless steel. Flush tank before heating the domestic water in the tank or warranty will be void.

System Components - As a minimum, a properly installed system will include the following major components

identified in Table 2-2. It is the responsibility of the installing contractor and system designer to consider all

aspects of a proper system design including compliance with local codes, including additional components

required for prevention of thermal-siphoning (i.e. heat traps), isolation valves, drain and purge valves, etc.

Table 2-2 Domestic Side Major Component Checklist

Factory Supplied Components Field Supplied Components

Indirect Water Heater System Backflow Preventor 2

Temp & Pressure Relief Valve (150PSI) DHW (Potable Water) Expansion Tank

2,3

Tank Sensor 1 Thermostatic (Anti-Scald) Mixing Valve

Drain Valve

Notes: 1 All NTI Indirect Water Heaters come standard with a Tank Sensor (not applicable for solar applications).

2 Check if required by local codes.

3 Expansion Tank is mandatory if using a System Backflow Preventor.


8

Indirect Water Heater - NTI Trin & Stor Indirect Water Heaters are equipped with a single-walled internal heat exchanger coil. To maintain the efficient and reliable operation of the heat exchanger, and to avoid heat exchanger failure, it is critical to ensure the rules and guidelines in this section are followed.

Locate the water heater in an area where leakage from the tank or plumbing connections will not result in water damage to adjacent areas or lower floors. If such a location is unavoidable, install a suitable catch pan with a drain under the appliance. This manufacturer is not responsible for any water damage that may occur in connection with the indirect tank or any of its components.

Temperature and Pressure Relief Valve - Each Indirect comes standard with a factory supplied temperature and pressure relief valve, sized to ASME specifications and compliant with Standard ANSI Z21.22•CSA 4.4 Relief Valves for Hot Water Supply Systems. The field installed relief valve and discharge piping is to be mounted on the Indirect Water Heater in accordance with Figures 2-3 and 2-4 and must be accessible for servicing or replacement. No valve is to be placed between the Relief Valve and the Indirect Water Heater or Relief Valve and discharge pipe. Install discharge piping as shown in Figures 2-3 and 2-4 and in accordance with Installation Checklist 2-1. Temperature and pressure relief valve provided with Sol-R-Therm is Watts 100XL-8.

T&P Normal Operation - The relief valve is not intended for constant duty such as repeated operation due to normal system expansion. If this occurs, correct the situation by installing a properly sized domestic expansion tank as per the expansion tanks manufacturer’s instructions.

Location - Do not conceal, plug, or remove the relief valve from its designated point of

installation. Failure to comply may result in property damage, personal injury or death.

Tank Sensor - designed for installation into the Thermal-Well of the Trin & Stor Indirect Water Heater; the Tank Sensor provides a temperature reading of the tank to an NTI-Trinity Tft, Lx or Tx series boiler, eliminating the need for a separate controller (e.g. the TPI Control Thermostat or other)*. The Tank Sensor incorporates a UL353 rated thermal cutoff switch designed to open at a temperature of 90ºC (194ºF). Tank Sensor installation instructions are detailed in Section 3.0.

*NTI-Trinity Ti and Ts series boilers are not designed to accept the Tank Sensor reading, therefore the TPI Control Thermostat, or other tank thermostat or aquastat, must be used.

Drain Valve - The Indirect water heater requires a field supplied drain valve to facilitate emptying the tank for inspection and servicing. Refer to Table 2-4 for drain port size and type.

System Backflow Preventor - Check if a backflow preventor (BFP) is required by local codes. Most plumbing codes require a thermal expansion control device be installed if a backflow preventor, pressure reducing valve or check valve is installed on a domestic supply line. If a backflow prevention device is used, then an expansion tank is mandatory (not optional) and must be installed downstream of any device used to control system thermal expansion. When using multiple indirects, check if a single BFP is required on the domestic supply or if each tank requires its own backflow preventor and respective expansion tank. See Figures 2-3 and 2-4.

DHW ( Potable Water) Expansion Tank - This manufacturer recommends installing an expansion tank in the domestic hot water system for the purpose of absorbing the increase in water volume caused by rising water temperature. If required by local codes, the expansion tank must be suitable for use with potable water and be sized in accordance with the water volume of the system and the firing rate of the boiler connected to the indirect water heater. Refer to the expansion tank manufacturer’s literature for proper sizing information.

Isolation Valves – Ensure any valves installed between the expansion tank and indirect

tank inlet are left in the OPEN position during normal operation. Failure to follow these

instructions may result in discharge of the Relief Valve and result in property damage or

personal injury.

Thermostatic (Anti-Scald) Mixing Valve - A mixing valve is recommended on branches supplying low temperature water to endpoint plumbing fixtures when domestic hot water is stored above 46°C (115°F).


9

Temperature Limiting Device - When the tank requires water at temperatures higher

than 46°C (115°F), a mixing valve shall be installed to temper the water and reduce the

risk of scalding. Failure to follow these instructions may result in serious injury or death.

Boiler System Piping

The NTI Trin & Stor line of high efficiency Indirect Water Heaters are intended to be heated by an external hot water boiler where hot water supplied from the boiler is connected to ports 4 and 5 on the indirect tank, and circulated through an internal heat exchanger coil in the tank. See Figures 2-3 and 2-4. The tanks are specifically designed for low temperature applications [<100

oC (210

oF)] and are NOT intended to be used as a pool heating

system or in conjunction with steam boilers or other high temperature appliances where water temperatures could potentially exceed 100

oC (210

oF). Refer to the Installation and Operation Manual included with the boiler for

detailed instructions on connecting boiler system piping to the indirect water heater.

High Temperature Applications - Trin & Stor Indirect Water Heaters are not to be used

for high temperture applications [greater than 100oC (210

oF)] or in conjunction with

steam producing systems as this will void the warranty. Failure to follow these

instructions may damage the tank resulting in property damage, serious injury or death.

Solar System Piping

The NTI Trin & Stor "S-SR" line of high efficiency Solar Indirect Water Heaters is intended to be heated by a

solar thermal system where a propylene glycol mixture, heated by the solar collectors, is circulated through the

internal heat exchanger coil in the tank. This manual does not cover installation of solar thermal system piping. If

installing a Solar Indirect Water Heater as part of an NTI Packaged Solar Domestic Hot Water System, refer to

Solar Plumbing section in the NTI Sol-R-Therm Manual for detailed instructions regarding solar system piping.

Domestic side piping for solar thermal can be done in a number of configurations depending on the application.

Since solar tanks are specifically designed for high temperature applications in the event of collector stagnation

and overheating, tank sensors specifically designed for these high temperature applications must be used instead

of the Tank Sensor (P/N 84632).

Tank Senor (P/N 84632) - The Tank Sensor is compatible with any Trin & Stor tank,

including "S-SR" models, when used as a normal indirect water heater. The Tank Sensor

is not intended for use with Solar Domestic Hot Water Systems. An alternate sensor and

thermostat control, normally provided with the solar thermal system, should be used.

Pre-heat Option - The most common application is where the solar water heater is plumbed in series with an

auxiliary water heater which is used as the primary storage tank. The hot water out (connection port 2) of the

solar water heater is connected to the cold water inlet of the auxiliary water heater, so when there is a demand

for domestic hot water, the auxiliary water heater immediately brings in pre-heated water from the solar tank

to replace it instead of cold water directly from the potable water system. In this configuration the upper heat

exchanger coil is not required, which is why connection ports 4 and 5 are capped. Refer to Figure 2-4 and

Table 2-1 respectively for location and sizes of connection ports for applicable solar models.

Back Up Option - This option is used when the solar water heater is the primary storage tank and solar water

heating alone is not enough to meet the domestic hot water demand. Hot water supplied from the boiler is

connected to ports 4 and 5 on the solar water heater and circulated through the upper heat exchanger coil in the

tank. See Figure 2-4. Refer to the Installation and Operation Manual included with the boiler for detailed

instructions on connecting boiler system piping to the indirect solar water heater.

Storage Option - This option is used when the solar water heater is the primary storage tank and is connected to

an additional storage tank for use as extra storage or as a dump zone for excess heat. In this method, hot water

from the solar water heater is transferred to the secondary storage tank using connections 4 and 5. Note that

flow direction is reversed for this application compared to the back up option. See Figure 2-4.


10

Figure 2-1 Indirect Water Heater Dimensions

Table 2-3 Indirect Water Heater Dimensions

Model Dimensions (inches)

A B C D E F G H I J K L M N

S40 56 54 3/4 46

3/4 46

3/4 29

1/8 25

1/8 26

1/8 9

3/8 2

1/8 2

1/8 20

1/8 - - -

S50 49 47 3/4 39

3/4 39

3/8 29

5/8 26 27 9

7/8 2 2 23

7/8 - - -

S65 70 5/8 69

1/4 60

1/4 60

1/4 32

1/2 27

1/8 28

1/8 10

1/4 2 2 21

7/8 - - -

S80 70 1/4 69 60

7/8 60 35 29

5/8 30

5/8 10

3/4 2

3/8 2

3/8 23

7/8 - - -

S120 - 64 3/4 53

5/8 53

1/4 44

5/8 40

5/8 41

5/8 12

1/4 2

3/8 2

3/8 28

7/8 - - -

S80SR 70 1/4 68

7/8 59

1/2 59

1/2 35

1/8 56

1/2 21

3/4 42

1/4 2 2 23

7/8 26

1/8 9

7/8 50

1/2

S120SR - 64 3/4 52

3/8 52

3/8 31

3/8 49

1/4 22

1/2 35

1/8 2 2 28

3/4 27

5/8 11

1/2 46

1/8


11

Figure 2-2 Solar Indirect Water Heater Dimensions Installation Checklist

1.

Install domestic side piping as per National and local codes. Refer to Figures 2-3 and 2-4.

2.

Do not over tighten brass threads on water supply connections.

3.

Do not apply heat to the cold water inlet on the indirect water heater.

4.

Mark the water supply for future reference.

5.

Install a mixing valve on the hot water outlet of the water heater as shown in Figure 2-3 and 2-4.

6.

Install boiler water connections (if used) as per the boiler manufacturer’s instructions.

7.

Cap (plug) any unused connection ports, such as domestic hot water recirculation.

8.

Install T&P relief valve on tank in accordance with local codes and Figures 2-1 through 2-4.

9. Ensure no valve is installed between the relief valve and indirect water heater or discharge pipe.

10.

Ensure discharge piping material used is rated to withstand temperatures up to 250

oF (120

oC).

11.

Direct discharge to a safe area (drain) where hot water or steam will not cause damage or injury.

12.

Terminate discharge pipe 6"-12" above the floor. Do not connect discharge pipe directly to a drain.

13.

Typical discharge pipe diameter ¾". Maximum pipe length is 15 feet with 2 or less elbows.

14.

Cut discharge end of pipe at a 45o angle to reduce

the risk of being blocked or capped.

15.

Install drain valve in the location and orientation shown in Figures 2-3 and 2-4.

16.

Verify with local codes if a backflow preventor or thermal expansion control device is required.

17.

Install a domestic expansion tank downstream of the backflow preventor (control device).

18.

Install the domestic expansion tank on the cold water supply of the domestic side piping.

19.

Flush the tank thoroughly before filling to heat water. Fill heat exchanger coil with heating fluid.

Table 2-4 Indirect Water Heater Connections

20. Insulate the last 5 feet of the cold water line and

all domestic hot water piping to R-2.6.

Model

Connection Port Sizes

T&P RV Hot Out Recirc Boiler In Boiler Out A-stat Lw Cold In Drain Solar In Solar Out A-stat Up

1 2 3 4 5 6 7 8 9 10 11

S40 ¾" F 1" M ¾" F 1" M 1" M Well 1" M - - - -

S50 ¾" F 1" M ¾" F 1" M 1" M Well 1" M - - - -

S65 ¾" F 1" M ¾" F 1" M 1" M Well 1" M - - - -

S80 ¾" F 1 ½" M ¾" F 1" M 1" M Well 1 ½" M - - - -

S120 ¾" F 1 ½" M ¾" F 1" M 1" M Well 1 ½" M - - - -

S80SR 1" F 1" F 1 ¼" F ¾" M ¾" M Well 1" M - ¾" M ¾" M Well

S120SR 1" F 1 ¼" M 1 ¼" F ¾" M ¾" M Well 1 ¼" M - ¾" M ¾" M Well

* Connections are NPT unless noted otherwise. All Aquastat (Tank Sensor) connections are friction fit immersion wells.


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Figure 2-3 IWH Domestic Plumbing Schematic


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Figure 2-4 Solar Indirect Water Heaters

Domestic Plumbing Schematic


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3.0 TANK SENSOR

The Tank Sensor is compatible with all NTI-Trinity Lx, Tft and Tx series boilers; follow the instructions below for proper installation, wiring and boiler control settings.

The Tank Sensor is NOT compatible with NTI-Trinity Ti and Ts series boilers; when using a Trin & Stor Indirect Water Heater with one of these boilers, the TPI Control Thermostat, or other thermostat or aquastat must be used. TPI Control Thermostat instructions are included with the TPI.

Installation Instructions

LOCATE THERMAL WELL INSERT TANK SENSOR

SECURE TANK SENSOR

Hook wire retainer to the back of the Thermal-Well rib;

pull to ensure it will not fall-out.

Connect to boiler using field wiring


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WIRE TANK SENSOR TO BOILER

Figure 3-1 Tank Sensor to Trinity Tft Boiler Figure 3-2 Tank Sensor to Trinity Lx Boiler

Figure 3-3 Tank Sensor to Trinity Tx & Vmax Boiler

Wire Tank Sensor to terminals COMMON and DHW AQUASTAT

Wire T

ank S

ensor

to L

ow

Volta

ge

term

inals

DH

W a

nd

Sen

so

r C

OM

Wire Tank Sensor to terminals COM and DHW AQUASTAT


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ADJUST BOILER CONTROL SETTINGS

In order for the boiler to operate correctly with the Tank Sensor, some control settings need to be adjusted.

Trinity Tft & Lx Series Boilers

Navigate to the Domestic Hot Water Configuration screen and make the following adjustments to the settings;

see Figure 3-4 (note: you must login before adjustments can be made):

1. Demand switch – change setting to “DHW sensor with On/Off temperatures”

2. Modulation sensor – maintain factory setting of “Outlet sensor”

3. Setpoint – set to the desired boiler operating temperature during a DHW demand. Typical setting =

170⁰F to 190⁰F.

4. Demand On temperature – tank temperature where a DHW demand is initiated, must be set lower than

the “Demand Off temperature. Typical setting = 120⁰F to 140⁰F.

5. Demand Off temperature – tank temperature where a DHW demand is ended, must be set higher than

the “Demand On temperature. Typical setting = 125⁰F to 145⁰F.

Figure 3-4 Trinity Tft & Lx Series Control Adjustments

For more information on adjusting the boiler control settings, refer to: APPENDIX A –

CONTROLLER AND TOUCHSCREEN DISPLAY INSTRUCTIONS FOR TRINITY Tft &

Lx SERIES included with the boiler.

Adjust to desired tank temperature

Adjust to desired boiler temperature

Set as illustrated

Must be logged in


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Trinity Tx & Vmax Series Boilers

Access the Installer Menu and navigate to setting 2-08 (DHW mode); adjust setting to “1” for the controller

function with a Tank Sensor. Set Installer Menu setting 2-07 (DHW setpoint) to the desired tank temperature.

See Figure 3-5.

Figure 3-5 Trinity Tx Series Control Adjustments

Adjust setting 2-08 to 1 as illustrated

For more information on adjusting the boiler control settings, refer to: INSTALLATION AND

OPERATION INSTRUCTIONS FOR TRINITY Tx BOILER included with the boiler.

Adjust setting 2-07 to the desired tank temperature

(e.g. 125-145⁰F)


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4.0 START UP AND CHECK OUT

Filling the Water Heater

1. Thoroughly flush the water heater so that three (3) times the tank’s volume has been drawn through it. 2. Verify water connections completed. 3. Close drain valve. Open highest hot water faucet. 4. Open cold water inlet valve and fill system. 5. Fill until a steady stream of water flows from the faucet. 6. Close the hot water faucet. 7. Ensure the boiler and domestic piping is free of leaks before proceeding to operational checklist.

Operational Checklist 1. Ensure all electrical connections are made correctly and no high voltage wires are exposed. 2. Verify the Tank Sensor is properly installed and is providing an accurate reading on the boiler display. In lieu

of the Tank Sensor ensure the Thermostat is correctly signaling the boiler to operate. 3. Verify the boiler control is set to deliver the desired DHW temperature. 4. Ensure the tank is filled with water. 5. Ensure that the tank’s heat exchanger coil(s) are filled with water or heat transfer fluid. 6. Ensure piping system is free of leaks and that air has been purged from system. 7. Initiate a call for domestic hot water by opening hot water taps on domestic water fixtures. 8. Verify that the boiler starts when there is a demand for hot water, and shuts down when the demand is

satisfied. 9. Verify proper circulator operation and boiler flow rate during a hot water demand. Allow all heating zones to

operate long enough to purge any remaining air from the system. 10. Check for proper operation of relief valve by opening it manually. 11. If T&P relief valve functions continuously during normal thermal expansion, the expansion tank may need to

be upsized.

5.0 ANNUAL MAINTENANCE AND INSPECTION

Inspection Checklist

1. Perform a visual inspection of all valves, drains, and system piping for signs of leaks.

Maintenance Checklist

1. Verify maximum water temperature at hot water fixtures to verify mixing valve temperature settings. 2. Manually operate T&P relief valve by moving lever to open position until hot water is released and allow it to

snap close. If closed relief valve continues to leak, close cold water inlet, drain tank, and replace relief valve. 3. If T&P relief valve functions continuously during normal thermal expansion, the expansion tank may need to

be upsized. 4. Ensure that boiler and/or solar thermal system is maintained in accordance with their installation manuals. 5. Check function of field-installed controls, thermostats, and circulators. 6. Check tank PH and chloride levels to determine if water chemistry is within the specified range. 7. Any additional procedures required by local codes.

Draining the Water Heater

1. Disconnect the power supply to the heat source. 2. Close the cold water supply shut off valve. 3. Allow appliance to cool before servicing to avoid burns. 4. Open the drain valve and divert water in tank to alternate storage location or floor drain. 5. Open highest hot water faucet to allow air to enter the system.


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6.0 PARTS LIST

Table 6-1 Indirect Water Heater

Item Part # Models Description

Trin & Stor parts available at any stocking wholesaler. Installers needing technical assistance can contact NTI directly at 1-800-688-2575.

1 84156 All Series (S, S-SR, SL) Relief Valve, T&P, ¾", 150 psi

2 84632 All Series (S, S-SR, SL) Tank Sensor

3 84158 All Series (S, S-SR, SL) TPI Control Thermostat

4 84217 SL-35, SL-50 Coil, 35/50 Gal

5 84218 SL-70 Coil, 70 Gal

6 84219 SL Series O-ring 6 1/4" ID for Coil

7 84220 SL Series O-ring 6 3/4" ID for Coil


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NY Thermal Inc. 30 Stonegate Dr. Saint John, NB E2H 0A4 Canada

Technical Assistance: 1-800-688-2575

Website: www.ntiboilers.com

Fax: 1-506-432-1135

Documents

Trin & Stor - NTI Boilers